ABB COV-7 Foglio di istruzioni - Pagina 12
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41-116.1C
150
100
50
0
0
12
The Trip Area May be Changed as Follows:
The line "bc" may be moved in the direction of arrow "y" by changing the voltage unit setting. The line
"ab" may be moved in the direction of arrow "x" by changing the CO unit tap setting. Tap value current
expressed in % Full Load defines line ab, and voltage unit setting expressed in % normal voltage de-
fines line bc.
b
x
50
a 100
CURRENT IN PERCENT OF FULL LOAD
Figure 3: Typical Tripping Characteristics of Type COV Relay
COV Voltage Controlled Overcurrent Relay
y
TRIP AREA
150
200
c
250
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